Genipin-crosslinked gelatin microspheres as a strategy to prevent postsurgical peritoneal adhesions: In vitro and in vivo characterization
BackgroundPeritoneal adhesions are a common complication after abdominal surgery. They cause small bowel obstruction, female infertility and chronic abdominal pain. Peritoneal adhesions also hamper uniform drug distribution in the peritoneal cavity, thereby reducing the efficacy of intraperitoneal chemotherapy after cytoreductive surgery.AimThe goal of this study was to develop a formulation that prevents peritoneal adhesions, evenly distributes in the abdominal cavity, and simultaneously extends residence time and improves local drug concentration. This report describes the formulation and characterization of genipin-crosslinked gelatin microspheres (GP-MS).Methods and resultsSpheroid gelatin microspheres were prepared by an emulsification solvent extraction method. A higher degree of crosslinking was obtained by increasing genipin concentration and crosslinking time. The degree of crosslinking allowed to tailor the degradation rate of GP-MS, hence their residence time. GP-MS did not affect cell viability. In vivo experiments showed excellent GP-MS biocompatibility and degradation characteristics. GP-MS were distributed evenly throughout the abdominal cavity. Adhesions were induced in Balb/c mice by application of an abraded peritoneal wall-cecum model. GP-MS-treated mice developed significantly less postsurgical adhesions compared to saline and Hyalobarrier® group. Histopathological examination showed a decrease of peritoneal inflammation over time in GP-MS-treated mice with complete recovery of peritoneal wounds post-operative day 14.ConclusionGP-MS are a promising strategy to prevent postoperative peritoneal adhesions and improve efficacy of postoperative intraperitoneal chemotherapy.
Journal: Biomaterials - Volume 96, July 2016, Pages 33–46